Already using one or more of the popular SMTP-rejection patches?
rejectutils is different. It provides Paul Jarc's realrcptto, Ward
Vandewege's badrcptto, Andrew St. Jean's qregex, and Russ Nelson's
viruscan in the form of standalone programs. rejectutils also provides
new programs that help you compose these (or any other) filters into
your configuration.

Homepage:
https://schmonz.com/software/rejectutils/
